Question

The only living member with cosmoid scale is represented by the genus
Answer
AO Latimeria
B.O Labeo
CO Channa
D.O Clarias​

Answer 1

The answer is :

Latimeria

Answer 2

A. Latimeria is the living genus possessing a cosmoid scale.

• Early fishes used to have several layers of scales to protect themselves from the harsh conditions the earth was going through.
• Cosmoid scales was one of the adaptations possesed by fishes for survival.
• Cosmoid scales consist of three layers. The foremost outer layer consisting of a hard enamel. The second layer consisting of a a specialised dentine called cosmine (hence the name cosmoid). The third innermost layer is isopedine or a vascular bony structure to protect the insides of the fish.
• Inside, all these layers early fishes used to have further modifications depending on habitat, weather and feeding conditions.